Spark-plug



W. M. ELLIS.

SPARK PLUG.

APPLICATION FILED JAN. 10, 1920.

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PATENT QFFIC WILLIAM m. ELLIS, or xnn'rorr, onro.

SPARK-PLUG.

nasasee.

Specification of Letters Patent.

Patented July as, 1921.

' Application filed January 10, 1920. Serial No. 350,657.

To all whom it may concem.

Be it known that I, WILLIAM M. ELLIS, a

, citizen of the United States, residin at Kenton, in the county of Hardin and tate of Ohio, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specification, reference being had to the accompanying drawings.

This'invention relates to certain improvements in spark plugs, and it is an object of the invention to provide a novel and improved device of this general character wherein an intensified spark is assured at the firing end ofthe plug and whereby it construction and in the combinationand arrangement of the several parts of my im-' proved sparkplug whereby certain important advantages are attained and the devlce rendered simpler, less expensive and otherwise more convenient and advantageous foruse, as will be hereinafter more fully set forth.

The novel features of my invention w1ll hereinafter be definitely claimed.

invention may be the will now proceed to de- Inorder that m better understood,

scribe the same with reference to the accompanying dr wings, wherein:

Flgure 1v is a view partly in sectlon and partly in elevation of a spark plug constructed in accordance with an embo lment of my invention.

Fig. 2 is a view of the firing end portion of the core as comprised in the plug as herein disclosed; and

Fig. 3 is a view in erspective of one of 1 the insulating sleeves erem embodied.

As disclosed in the accompanying drawings, B denotes a body or shell of conductive material of any ordinary or preferred type and through which is disposed in a well known-manner the core 0 of orcelain .or other suitable material. The firm end por tion of the core C is provided wit the substantially diametricall opposed recesses 1, preferably substantia y concave in cross section. Loosely extending through the core C longitudinally thereof are the conductor w res 2 having their firing ends extending wlthin the recesses 1 hereinbefore referred to. Each of said-wires adjacent its firing end is provided with a shoulder 3 adapted to contact with the upper or outer end wall of the recess 1 in a manner to be hereinafter referred to. The opposite end portion of the conductor wire 2 is surrounded by a sleeve 4, preferably of brass, embedded Within the core 0 with. the outer face of said sleeve 4 substantiall flush with the adjacent end of the core Overlyin the outer end of the core C is a washer of insulated material and through which the conductor wires 2 also to draw the 'coacting conductor wire 2 through the core C with the shoulder 3 thereof in contact with the end Wall of the recess 1 as hereinbeforereferred to.

Suitably en aged with substantially the axial center 0 the washer W and between the adjacent end portions of the conductor wire 2 is a post 6 of metal and which has engaged therewith the nuts 7 to provide means wherebya conductor a leading from a coil or the like may be electrically connected with said post.

The outer face of the washer W is provided with an annular groove 8 substantially concentric to the post 6' and which is adapted 'to receive the marginal edge of a concavoconvex cover 9, preferably of glass, and through the axial center of which the post 6 is also disposed. The inner nut 7 engages the cover 9 and operates to clamp the cover in applied position. The cover 9 serves to protect the adjacent'terminals'of the conductor'wires 1 and the nuts 5 thereon against water, dirt, or the like and which would otherwise tend to interfere with the proper gap-ping between said terminals of the wires 2 or the nuts 5 and the post 6. It is also pre ferred that the inner nut 7 be. knurled and the outer or second nut 7 be of hexagon type.

I also find it ofadvantage to surround 'each of the nuts 5 with a sleeve 11 of inand s irit thereof, and forthis reason the current from-said nut 5 and the post 6 will occur. Upon properly rotating the sleeve 11, this gapping can be prevented. this means it Wlll be conceived that in accordance with the requirements of practice, either or both of the conductor wires 2 may be caused to spark at the firing end of the plug.

From the foregoin thought to be obvious t at a spark plug constructed in accordance with my invention is particularly well adaptedfor use b reason of the convenience and facility wit which it may be assembled'and operated, and it will also be obvious that 'my invention is susceptible of some change and modification without departing from the princi 15s 0 not wish to'be understood as limiting myself to the precise arrangement and forma-- tion of the several parts herein shown In carrying out my invention in practice'except as hereinafter claimed. I

I claim 1. A s ark plug including a cdre, a conductor. wire disposed through the core, a post carried by the core and a apted to be connected with a source of electrical energy, said post being-to one side of an end portion of the conductor wire, and means for insulating, at vwill, the conductor wire from the post. a

2. A s ark plug includin a core, a conductor wire. disposed thro carried by the core and :dapted to be connected with a source of electrical energy, said description, it is a the core, a post post being to one side of an end portion of 'theconductor wir and a sleeve of insulating material surro nding the end portion of the conductor wire adjacent the 0st, said sleeve being provided in its wail with a s 0t.

3. A spark plug including a core provided at one end with substantially diametrically opposed recesses in its side faces, conductor wires disposed through the core and extending within the recesses, a post extending outwardly from the opposite end of the core at a point-between the conductor wires and spaced therefrom, said faces being adapted to be connected to a source of electrical energy, and means for insulating, at will, either of the conductor wires with the respect to the post.

4. A s ark plug including a core, a conductor wire disposed throu h the core, apost carried b the core and adapted to be connected with a source of" electrical energy, said post being spaced from the conductor wire, and means for insulating said post and wire, at will, one from the other.

- 5. A s ark plug including a core, a conducto'r wire disposed throu h the core, a post carried by the core and adapted to be connected with a source of electrical energy, said post being spaced from the conductor wire, and means for insulating said post and .Wire one from the other.

In testimony, whereof I hereunto afiix my signature. 7

WILLIAM M. ELLIS. 

